* {
  margin: 0;
  padding: 0;
}
.screen {
  height: 100vh;
  width: 100vw;
}
.flex-center {
  display: flex;
  justify-content: center;
  align-items: center;
}
.circle {
  border-radius: 50%;
}
body {
  height: 100vh;
  width: 100vw;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: black;
}
body .my-button {
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100px;
  width: 100px;
  cursor: pointer;
  animation: setColor 1.5s linear infinite alternate, zhuan 1.5s linear infinite normal;
}
@keyframes setColor {
  from {
    box-shadow: 0 0 1px 1px #77f, 0 0 0px 0px #f77, 0 0 0px 0px #ff7, 0 0 2px 2px white;
  }
  to {
    box-shadow: 0 0 10px 4px #77f, 0 0 16px 10px #f77, 0 0 24px 16px #ff7, 0 0 24px 22px white;
  }
}
@keyframes zhuan {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(3600deg);
  }
}
